Line Chart

Type: line_chart • Category: visualization

Description

Store time-value points (list) for line chart widget

Parameters

Name	Type	Description	Required	Default
widgetId	hidden		no
rowsExpr	string	Expr -> list[dict] (each dict: ts/value or multiple numeric fields)	no
timestamp	string		no
fields	fields_multi	Subset of numeric field names to include (auto multi-series). Leave empty for all.	no
shade	boolean	Fill area under lines (cienie).	no	true
limit	number		no	500

Help

Line Chart Worker - Time Series Visualization

Create interactive line charts for time series data with support for multiple data series and area shading.

Data Sources:

• rowsExpr: Expression returning list[dict] where each dict contains timestamp and numeric values
• timestamp: Field name containing timestamps (auto-detected from data)
• fields: Select specific numeric fields for plotting (leave empty for all numeric fields)
• limit: Maximum data points to display (default: 500)

Features:

• Multi-series: Plot multiple numeric fields as separate lines
• Time axis: Automatic timestamp detection and formatting
• Area shading: Optional fill under lines for better visualization
• Interactive: Zoom, pan, and hover tooltips
• Auto-detection: Automatically finds timestamp and numeric fields

Data Format: Each row should contain:

• Timestamp field (detected automatically or specified)
• One or more numeric value fields

Examples:

• Single series: rowsExpr="data.prices", timestamp="ts", fields=["close"]
• Multi-series: rowsExpr="data.metrics", fields=["cpu","memory","disk"]
• All fields: rowsExpr="data.sensors" (plots all numeric fields)

Performance:

• Efficient rendering for large datasets
• Configurable point limits to prevent slowdown